<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/137185>137185</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            [Loop Vectorize] Crash: Assertion `CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!"'
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            new issue
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          Nirhar
      </td>
    </tr>
</table>

<pre>
    Here is the godbolt link to the reproducer: https://godbolt.org/z/354qYx43T
For the record here is the IR:
```
source_filename = "reduced.ll"
target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-i128:128-f80:128-n8:16:32:64-S128-ni:1-p2:32:8:8:32-ni:2"
target triple = "x86_64-unknown-linux-gnu"

define void @widget() {
bb:
 %sitofp = sitofp i32 0 to double
  br label %bb1

bb1: ; preds = %bb1, %bb
  %phi = phi i32 [ %add, %bb1 ], [ 0, %bb ]
  %phi2 = phi double [ %fsub, %bb1 ], [ 0.000000e+00, %bb ]
 %fsub = fsub double %phi2, %sitofp
  %add = add i32 %phi, 1
  %icmp = icmp ult i32 %phi, 252
  br i1 %icmp, label %bb1, label %bb3

bb3: ; preds = %bb1
  %phi4 = phi double [ %phi2, %bb1 ]
  %phi5 = phi double [ %fsub, %bb1 ]
  ret void
}
```
which fails when running: `opt -passes=loop-vectorize -slp-threshold=-99999 -force-vector-width=4` with the backtrace:
```
opt: /root/llvm-project/llvm/lib/IR/Constants.cpp:2231: static llvm::Constant* llvm::ConstantExpr::getCast(unsigned int, llvm::Constant*, llvm::Type*, bool): Assertion `CastInst::castIsValid(opc, C, Ty) && "Invalid constantexpr cast!"' failed.
PLEASE submit a bug report to https://github.com/llvm/llvm-project/issues/ and include the crash backtrace.
Stack dump:
0.      Program arguments: /opt/compiler-explorer/clang-assertions-trunk/bin/opt -o /app/output.s -S -passes=loop-vectorize -slp-threshold=-99999 -force-vector-width=4 <source>
1.      Running pass "function(loop-vectorize<no-interleave-forced-only;no-vectorize-forced-only;>)" on module "<source>"
2.      Running pass "loop-vectorize<no-interleave-forced-only;no-vectorize-forced-only;>" on function "widget"
 #0 0x00000000054eff68 llvm::sys::PrintStackTrace(llvm::raw_ostream&, int) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x54eff68)
 #1 0x00000000054ed8f4 SignalHandler(int, siginfo_t*, void*) Signals.cpp:0:0
 #2 0x00007ccdb7442520 (/lib/x86_64-linux-gnu/libc.so.6+0x42520)
 #3 0x00007ccdb74969fc pthread_kill (/lib/x86_64-linux-gnu/libc.so.6+0x969fc)
 #4 0x00007ccdb7442476 gsignal (/lib/x86_64-linux-gnu/libc.so.6+0x42476)
 #5 0x00007ccdb74287f3 abort (/lib/x86_64-linux-gnu/libc.so.6+0x287f3)
 #6 0x00007ccdb742871b (/lib/x86_64-linux-gnu/libc.so.6+0x2871b)
 #7 0x00007ccdb7439e96 (/lib/x86_64-linux-gnu/libc.so.6+0x39e96)
 #8 0x0000000005166c4b llvm::ConstantExpr::getCast(unsigned int, llvm::Constant*, llvm::Type*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x5166c4b)
 #9 0x0000000000d41160 llvm::IRBuilderBase::CreateTrunc(llvm::Value*, llvm::Type*, llvm::Twine const&, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0xd41160)
#10 0x00000000045b9885 llvm::VPScalarIVStepsRecipe::execute(llvm::VPTransformState&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x45b9885)
#11 0x0000000004576263 llvm::VPBasicBlock::executeRecipes(llvm::VPTransformState*, llvm::BasicBlock*) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x4576263)
#12 0x000000000457e734 llvm::VPBasicBlock::execute(llvm::VPTransformState*) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x457e734)
#13 0x000000000457f740 llvm::VPRegionBlock::execute(llvm::VPTransformState*) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x457f740)
#14 0x000000000458abda llvm::VPlan::execute(llvm::VPTransformState*) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x458abda)
#15 0x000000000442b57c llvm::LoopVectorizationPlanner::executePlan(llvm::ElementCount, unsigned int, llvm::VPlan&, llvm::InnerLoopVectorizer&, llvm::DominatorTree*, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x442b57c)
#16 0x0000000004443b38 llvm::LoopVectorizePass::processLoop(llvm::Loop*) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x4443b38)
#17 0x0000000004445ce0 llvm::LoopVectorizePass::runImpl(llvm::Function&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x4445ce0)
#18 0x0000000004446333 llvm::LoopVectorizePass::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x4446333)
#19 0x00000000031c103e llvm::detail::PassModel<llvm::Function, llvm::LoopVectorizePass, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x31c103e)
#20 0x00000000052e90a0 llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x52e90a0)
#21 0x0000000000e7bace llvm::detail::PassModel<llvm::Function, llvm::PassManager<llvm::Function, llvm::AnalysisManager<llvm::Function>>, llvm::AnalysisManager<llvm::Function>>::run(llvm::Function&, llvm::AnalysisManager<llvm::Function>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0xe7bace)
#22 0x00000000052e7973 llvm::ModuleToFunctionPassAdaptor::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x52e7973)
#23 0x0000000000e7a98e llvm::detail::PassModel<llvm::Module, llvm::ModuleToFunctionPassAdaptor, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0xe7a98e)
#24 0x00000000052e7380 llvm::PassManager<llvm::Module, llvm::AnalysisManager<llvm::Module>>::run(llvm::Module&, llvm::AnalysisManager<llvm::Module>&) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x52e7380)
#25 0x000000000094707a llvm::runPassPipeline(llvm::StringRef, llvm::Module&, llvm::TargetMachine*, llvm::TargetLibraryInfoImpl*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::ToolOutputFile*, llvm::StringRef, llvm::ArrayRef<llvm::PassPlugin>, llvm::ArrayRef<std::function<void (llvm::PassBuilder&)>>, llvm::opt_tool::OutputKind, llvm::opt_tool::VerifierKind, bool, bool, bool, bool, bool, bool, bool) (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x94707a)
#26 0x000000000093a84c optMain (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x93a84c)
#27 0x00007ccdb7429d90 (/lib/x86_64-linux-gnu/libc.so.6+0x29d90)
#28 0x00007ccdb7429e40 __libc_start_main (/lib/x86_64-linux-gnu/libc.so.6+0x29e40)
#29 0x0000000000932485 _start (/opt/compiler-explorer/clang-assertions-trunk/bin/opt+0x932485)
Program terminated with signal: SIGSEGV
Compiler returned: 139
```
</pre>
<img width="1" height="1" alt="" src="http://email.email.llvm.org/o/eJzcWltT9KjW_jV4Q6WLQI4XXsTWnrG-eb9tqWXVvrJIQrrZ0pANxMP8-l1A2nRandGZfmemXku7CazDsx4WKyRIjeFrydgpSM9Aen5CB7tR-vT_ud5QfVKr9uX0Z6YZ5AbaDYNr1dZKWCi4fIBW-T7Neq3aoWEakApurO0NIBXAK4BXo_xC6TXAq18BXpE0-e-_nxNyC1C1Unq00Cjdws2eo8trZwNVIEPjL6qMGnTD7jsumKRbBgE5hwBjzZzzdiEEwBigylK9Zha21FJBX9Rgd4Is2gJSsajHOQKkIth_uMt4fulaWeI_Iv7aiHEBSBXjIuoKNLak78p26lkS3fhu7rqjHu8GivGP4DCGZ1Ct5r14jee5yO6zJBrkg1RPMhJcDs_RWg5BBaCqZR2XDD4q3kKQoCferpkFuAC4hCA_A6iq68AeBDg13Kqu98bHJicYIjd7rRpqwZwcrDUUtGbCadR1HBy5BqkgIGew16w1I0IvgJeh5bUBTvsN98Pu2zkA6Znrpm37KhpDkJ77q_QMotdu3ztZwa9mArydpc4M9QemFsj_MIDP0Fu7o6436xs7u8HdKB-42eGgbevl3bePxss60XgnwpttYNU3BmEPBHGKd8zyeKfgBmY8z6_JjnfyIe8TUckHRO0FtSNqUko_z65T0sz6PHO48vOD9fi04c0GdpQLA582TEI9SMnl2mPPkOotjHpqDDOAnAul-uiRNVZp_iuDkRF9ZDeamY0SLSDnUel-YNQp3bBRMHrird0Acp6ADMEnbje-NtS0ebCaNuxtiVC99d7xSitlAV4J8biNeq3-w5rdpfviNcCry2uAV0sljaXSmkXT925lYuKT3lhqeQO9AqkAqXaCAFfv9F489zr0rJldUuPW4yB9bW0hd1rL923NB25fejZ21koJgEuHpTKGacuVdLQ645fS2KDQuCtzRwVvAS5U3zjVpfu4ffH1AGcAZ66sXMpHJwWb0Td77jVsPNLYlRac-6lk7QKg6uqXi-rmApqh3nILKayHtavzSltXNw5qPLeboV40artH8Jx2bszADMArSKWjoxFDy_xcNpqazTSjzveNpc0DbIdtH-YXLQAqr7Raa7qFVK-HLZPWjNPsJhyvGrXtuWA6Ys-9UJpp1yeoXEd0R52JrB7kA8CrmsugCCPlTNC-d9eD7Qe7MDC6OVrWQkCW4aYFyAVAVewiuQ6LBDofbl66QTYOIMDF3BsgS6kiLi3TgtFHFpy0kZLiBZAzqSbRgyHnDZcAY6gk3Kp28NUOz9D4mwl-D9BRUXgIuxCd9d3dCofSTBBEz2j3kyas67Jib0GYFxMaV5pL61Pj1i99XExCmj7dK2M1o1uf78uw4lz2F38yR9wt5XmE5TgNoOMD0G3RJfCGryUVP1PZCme8GFe94WsuO3W_W-y-nLpmOWrsKg_yf8EBHh3kTdPWeZLgFKMxmlC7xk3C3ubADTQLoxaZx-xVJsRkbrDMyq6BvUtl2t4_cCG-Zt3rT9aTQ7hJnsG18eF9FXaSZ5PhdG4YF3lHIK1dHfqSWa84mc3emI3rLxuM68lgPjdISlZmXzPoVSaDxSzD4ixrkvqvvO0cbekE6FNg5X5gqE3iOEN7SC6vzwYuWqbPqGEjas2oZbd6kM1s1d9RMbDfCmWv88ltmP2dbywQIcyjhxviCdG6OjGrbklal0WR7uG6u7ppqKD68u7Gst5cs4b3Y9TsmTWDnde5u6tbTaXplN7eWOoGsyNiH-FN4OM5-DzDGZmBP6OGN2dCNQ8zzCEM8zvQD6Zoz1YojkeLyuOeosIHUbGcJJ-J6vfDOSZmh2rCTA4wd3mCZpiv2Zor-XeDdrAm0MkcdEHrls5ACyr_PrAezgQ2nYFNcJ3m-5v_X5Tq78Z9DnWGHXjJ9Ay_D2g_hgvB3F51qYZQiT-uzIGMUJr2iqFzse_ahXggc662XFKr9K1m36mGj3RMZGVzshJSk-IDstgVNeMOrteqYca40RlLoeOosxsgTYDzA8Bpw9DvA9aDvNz2YgZ29bpbP2rpDZAmwMUB4IwQ8inAH4PdT5pKUvFiuPlGJV27LF6-o-S270cO0oUxBTnbCpC4iRFheyBbZikX4-6fGvNNtUy8D3UW3Fty_lDs7vefT-pI2yupeP48hVmJ6H6qeyJ_C-APzNXIxsTVbIODWF7T5hgJ-N04_oHnJpA_TQ0-SOO8zPcL4Df_UuNW7fA4yquW9lbp96MNCl-KdVT5DlnogplCJQdZSMvia1m4i235SYL-AAMfJdE_h9bA28RqcphApPhMHXyPyx-FopGFiaPZpheVSY7y_R26HnzaXPGeCS7n2_Mbq7lcX7PuvbR7E-ytP-f6RpuNt3P4dO5Hf-G1pvrlUnYq7LoOpZQS__IvaVdcvGPkTw1_EE6lNX1xvfuz4zkRw5rLtzV5kje2DX2v73fJMpzY7dPobI0vPMJcv1fpVW_vrdvS-6sQxf9x2f6W1B3TvONM7-Tm7zs--3201Au5NWVeNs88Qoukgaq33yiXR_PprU4-D97R4bItv_hO1atMBotDgyxB8P7e6dwbS7W9307hfNoF23uGxuUBTzgpUhiMH48mZzS43J2yWKb9UyVrw6lbeJMLSAVvLn-6ufjpDqBqObqEmtlBS-bSHcak3D-RO2lPSVuSkp6w0zhP0hSlCSInm9MWk7hrWIkLhro0ximNMUvLPK1RjEhJTvgpRjhFCU7ihGQJWaAuy1PcFWWXMxpTDBLEtpSLhVsBC6XXJ_6Q6TQmeVykJ_5Q1fj_asBYsifoRwHGID0_0af-fKoe1gYkSHBjzWTGciv8v0O45wj4-iAB0nO41NRs_sIDuZNBi9M_ftg2UvF4iv8XAAD__5NpVd0">